Diamond



FIG. 1 is a first perspective view of a diamond showing my new design;

FIG. 2 is a second perspective view of FIG. 1;

FIG. 3 is a top plan view of FIG. 1;

FIG. 4 is a bottom plan view of FIG. 1; and,

FIG. 5 is a side view of FIG. 1.

CLAIM The ornamental design for a diamond, as shown and described.